SQLSERVER ストアド プロシージャによって返されたカーソルの処理

1. ストアド プロシージャはカーソルを返します

SQL コード

USE [TEST_DB]  
GO  
  
/****** [PRT].[Move_Data_Return_Cursor]   Script Date: 03/08/2012 17:38:55 ******/  
SET ANSI_NULLS ON  
GO  
  
SET QUOTED_IDENTIFIER ON  
GO  
  
/*********************************************************************************  
*把数据从表 DATA_SOURCE_TABLE 移动到表 TEST_TABLE .  
返回游标供Move_Data_Handle_Cursor供Move_Data_Handle_Cursor存储过程使用.  
*DataServer: 110.110.110.110  
*DataBase:   TEST_DB  
*Name:       [Move_Data_Return_Cursor]  
*Function:     
*Input:      @overTimeHour INT  
*Output:       @CURSOR_PriceChangeRecord CURSOR  
*Creator:    GREATWQS 2012-02-23  
*Updated:    GREATWQS 2012-03-08  UPDATE NEW REQUIREMENT  
**********************************************************************************/  
ALTER PROCEDURE [PRT].[Move_Data_Return_Cursor]   
    -- Add the parameters for the stored procedure here   
    @overTimeHour INT,  
    @CURSOR_PriceChangeRecord CURSOR VARYING OUTPUT  
AS  
  
BEGIN  
      -- SET NOCOUNT ON added to prevent extra result sets from  
      -- interfering with SELECT statements.  
      SET NOCOUNT ON;  
          
      -- print @overTimeHour;  
        
      -- 1. 声明游标: DECLARE CURSOR_PriceChangeRecord  
      SET @CURSOR_PriceChangeRecord = CURSOR  
      FORWARD_ONLY  STATIC    
      FOR   
         SELECT ItemNo,  
                ItemName,  
                ItemColor,  
                ItemSize,  
                ItemMadeIn,  
                InDate   
         FROM   PRT.DATA_SOURCE_TABLE  WITH(NOLOCK)  
         WHERE  InDate > dateadd(HOUR, -@overTimeHour, getdate())  
         -- 在这里进行时间的限定.   
           
    -- 2. 打开游标  
    OPEN @CURSOR_PriceChangeRecord  
      
END

2. ストアド プロシージャはカーソル

SQL コード

USE [TEST_DB]  
GO  
  
/****** [PRT].[Move_Data_RHandle_Cursor]  Script Date: 03/08/2012 17:39:27 ******/  
SET ANSI_NULLS ON  
GO  
  
SET QUOTED_IDENTIFIER ON  
GO  
  
/*********************************************************************************  
*把数据从表 DATA_SOURCE_TABLE 移动到表 TEST_TABLE  
*把游标中的数据,插入到表TEST_TABLE.  
*DataServer: 110.110.110.110  
*DataBase:   TEST_DB  
*Name:       [Move_Data_Handle_Cursor]  
*Function:     
*Input:      @overTimeHour INT  
*Output:       
*Creator:    GREATWQS 2012-02-23  
*Updated:    GREATWQS 2012-03-08  UPDATE NEW REQUIREMENT  
**********************************************************************************/  
ALTER PROCEDURE [PRT].[Move_Data_Handle_Cursor]   
    -- 超时时间(小时)  
    @overTimeHour INT  
AS  
BEGIN  
    -- SET NOCOUNT ON added to prevent extra result sets from  
    -- interfering with SELECT statements.  
    SET NOCOUNT ON;  
      
    DECLARE  
         -- 需要插入表TEST_TABLE,数据来源声明  
         @ItemNumber_Insert       CHAR(20),  
         @ItemName_Insert         CHAR(50),  
         @ItemColor_Insert        CHAR(10),  
         @ItemSize_Insert         CHAR(5),  
         @ItemWhereMadeIn_Insert  CHAR(20),  
         @createTime_Insert       DATETIME,  
         @changeTime_Insert       DATETIME,  
         @lastChangeTime_Insert   DATETIME,  
         @priority_Insert         INT,  
         @itemType_Insert         INT,  
         @active_Insert           INT,  
         -- ItemNumber Record num in table  
         @totalNum_SelectDB       INT,  
         @changeTime_SelectDB     DATETIME  
      
    -- Set Default Value  
    SET @ItemWhereMadeIn_Insert   = 0  
    SET @createTime_Insert        = getdate()  
    SET @lastChangeTime_Insert    = null  
    SET @priority_Insert          = 0  
    SET @itemType_Insert          = 0  
    SET @active_Insert            = 1  
      
    -- 1. 声明游标: 在过程内部自己定义有游标时,调用游标前面不加@符号  
    DECLARE @CURSOR_Result CURSOR  
        
    -- 2. 得到上个游标, 上个游标已经打开  
    EXEC Move_Data_Return_Cursor @overTimeHour,   
         @CURSOR_PriceChangeRecord = @CURSOR_Result OUTPUT  
        
    -- 3. 抓取游标中的数据: FETCH CURSOR_Result  
    FETCH NEXT  FROM  @CURSOR_Result  
    INTO  @ItemNumber_Insert,   
          @ItemName_Insert,   
          @ItemColor_Insert,   
          @ItemSize_Insert,   
          @changeTime_Insert  
      
    -- 4. 对游标中的每一个记录进行处理: 循环  
    WHILE (@@FETCH_STATUS = 0)  
    BEGIN    
         -- 查看此ItemNumber_Insert是否已经存在表中  
         SELECT TOP 1 @totalNum_SelectDB = COUNT(*)   
         FROM PRT.TEST_TABLE WITH(NOLOCK)  
         WHERE ItemNumber = @ItemNumber_Insert           
           
         -- 如果表不存在此@ItemNumber_Insert, 则插入  
         IF @totalNum_SelectDB = 0  
         BEGIN  
             INSERT INTO PRT.TEST_TABLE(  
                    [ItemNumber],  
                    [ItemName],  
                    [ItemColor],  
                    [ItemSize],  
                    [MadeIn],  
                    [createTime],  
                    [changeTime],  
                    [lastChangeTime],  
                    [priority],  
                    [itemType],  
                    [active])  
              VALUES (   
                    @ItemNumber_Insert,  
                    @ItemName_Insert,  
                    @ItemColor_Insert,  
                    @ItemSize_Insert,  
                    @ItemWhereMadeIn_Insert,  
                    @createTime_Insert,  
                    @changeTime_Insert,  
                    @lastChangeTime_Insert,  
                    @priority_Insert,  
                    @itemType_Insert,  
                    @active_Insert  
                   )  
         END  
         -- 如果此ItemNumber存在于表中  
         ELSE   
         BEGIN  
             -- 查看此ItemNumber_Insert的记录  
             SELECT TOP 1 @changeTime_SelectDB = changeTime  
             FROM PRT.TEST_TABLE WITH(NOLOCK)  
             WHERE ItemNumber = @ItemNumber_Insert  
               
             -- If item has exists in table, and changeTime<=newItem.changeTime   
             -- fresh the changeTime = newItem.changeTime, set active=1;  
             IF @changeTime_SelectDB < @changeTime_Insert    
             BEGIN  
                 UPDATE PRT.TEST_TABLE  
                 SET    changeTime = @changeTime_Insert,   
                        active = 1  
                 WHERE  ItemNumber = @ItemNumber_Insert  
             END  
         END  
           
         -- FETCH NEXT RECORD FROM @CURSOR_Result  
         FETCH NEXT  FROM  @CURSOR_Result  
         INTO  @ItemNumber_Insert,   
               @ItemName_Insert,   
               @ItemColor_Insert,   
               @ItemSize_Insert,   
               @changeTime_Insert  
    END  
      
    -- 5. 关闭游标  
    CLOSE @CURSOR_Result  
      
    -- 6. 删除游标  
    DEALLOCATE @CURSOR_Result      
      
    -- Delete overtime  item, set active=0：changeTime<getdate()-48；  
    UPDATE PRT.TEST_TABLE  
    SET    active=0  
    WHERE  changeTime < dateadd(HOUR, -@overTimeHour, getdate())  
      
END

を返します